s1_goto_dir() {
	cd "$1"
}
s2_touch_empty_file_with_givne_name() {
	touch "$1"
}
S3_make_directories() {
	mkdir -p projects/git projects/backup
}
s4_create_6_files() {
	cd projects
	touch linux1_centos linux1_redhat linux1_c_programming linux2_centos linux2_redhat linux2_c_progrmming
	cd ..
}
s5_make_directories_in_git() {
	mkdir -p projects/git/linux1 projects/git/linux2
}
s6_move_files_to_dir_1_or_2() {
	mv projects/linux1_* projects/git/linux1/
	mv projects/linux2_* projects/git/linux2/
}
s7_create_package_and_comproess() {
	tar -czvf projects/backup/git.tar/gz -C projects git
}
s8_delete_dir_git() {
	rm -rf projects/git
}
s9_recover_from_git_tar_gz_backup() {
	tar -zxvf projects/backup/git.tar.gz -C projects
}
s10_create_package_and_compress() {
	tar -jcvf projects/backup/git.tar.bz2 -C projects git
}
s11_find_and_sort_alphabewtically_all_created_files_and_dirs() {
	find ./projects -type f-o -type d |sort
}
s12_get_next_15_minutes_boundary() {


	date -d "@$(( (($(date +%s) / 900) +1) * 900))" "%Y-%m-%d_%H:%M:%S"
}
